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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
	Sasha Levin <sashal@kernel.org>,
	devel@driverdev.osuosl.org,
	Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
	linux-media@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 387/671] media: Staging: media: Release the correct resource in an error handling path
Date: Thu, 16 Jan 2020 12:00:25 -0500
Message-ID: <20200116170509.12787-124-sashal@kernel.org> (raw)
In-Reply-To: <20200116170509.12787-1-sashal@kernel.org>

From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>

[ Upstream commit 3b6471c7becd06325eb5e701cc2602b2edbbc7b6 ]

'res' is reassigned several times in the function and if we 'goto
error_unmap', its value is not the returned value of 'request_mem_region()'
anymore.

Introduce a new 'struct resource *' variable (i.e. res2) to keep a pointer
to the right resource, if needed in the error handling path.

Fixes: 4b4eda001704 ("Staging: media: Unmap and release region obtained by ioremap_nocache")

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/staging/media/davinci_vpfe/dm365_ipipe.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/media/davinci_vpfe/dm365_ipipe.c b/drivers/staging/media/davinci_vpfe/dm365_ipipe.c
index 95942768639c..7bf2648affc0 100644
--- a/drivers/staging/media/davinci_vpfe/dm365_ipipe.c
+++ b/drivers/staging/media/davinci_vpfe/dm365_ipipe.c
@@ -1777,7 +1777,7 @@ vpfe_ipipe_init(struct vpfe_ipipe_device *ipipe, struct platform_device *pdev)
 	struct media_pad *pads = &ipipe->pads[0];
 	struct v4l2_subdev *sd = &ipipe->subdev;
 	struct media_entity *me = &sd->entity;
-	struct resource *res, *memres;
+	struct resource *res, *res2, *memres;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 4);
 	if (!res)
@@ -1791,11 +1791,11 @@ vpfe_ipipe_init(struct vpfe_ipipe_device *ipipe, struct platform_device *pdev)
 	if (!ipipe->base_addr)
 		goto error_release;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 6);
-	if (!res)
+	res2 = platform_get_resource(pdev, IORESOURCE_MEM, 6);
+	if (!res2)
 		goto error_unmap;
-	ipipe->isp5_base_addr = ioremap_nocache(res->start,
-						resource_size(res));
+	ipipe->isp5_base_addr = ioremap_nocache(res2->start,
+						resource_size(res2));
 	if (!ipipe->isp5_base_addr)
 		goto error_unmap;
 
-- 
2.20.1

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Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200116170509.12787-1-sashal@kernel.org>
2020-01-16 16:58 ` [PATCH AUTOSEL 4.19 296/671] staging: android: vsoc: fix copy_from_user overrun Sasha Levin
2020-01-16 17:00 ` Sasha Levin [this message]
2020-01-16 17:02 ` [PATCH AUTOSEL 4.19 518/671] staging: greybus: light: fix a couple double frees Sasha Levin

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